🐛[bug] The Jupyter Lab Webpage doesn't show anything.

[dhiyu]

Describe the bug

Hello!
I deploy a cluster for my peers, but I encountered a fatal problem.
There are four agents in my cluster, I deployed them by the same way. But only one agent can show the JupyterLab page, others can't.
I try to find out the problem by view the log in WebUI. Then, here is the agent which is able to connect:

Oherwise, other all agents can not show anything on JupyterLab webpage, like this:

The log is:

It seems that it accessed the localhost(127.0.0.1) and returned a 404 error rather a proxy address which is I mentioned before.
So how to settle it? Can anybody help me? Thanks!

Reproduction Steps

1. Launch a new JupyterLab
2. Open the task created in step 1.
3. The webpage show nothing.

Expected Behavior

Screenshot

Environment

• Device or hardware: X86 machine with NVIDIA graphical cards.
• OS: Unbuntu 22.04 LTS.
• Browser: Chrome.
• Version: 0.19.5 (latest at the writing time).

Additional Context

No response

[ioga]

hello, it seems this issue has fallen through the cracks, sorry about that. is it still an issue for you?